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Comparison of Boundary Smoothness for an Analytic Function and for its Modulus in the Case of the Upper Half-Plane

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Results of a recent paper by A. V. Vasin, S. V. Kislyakov, and the author are extended to the case of outer functions in the upper half-plane. As in the… Click to show full abstract

Results of a recent paper by A. V. Vasin, S. V. Kislyakov, and the author are extended to the case of outer functions in the upper half-plane. As in the case of the disk, it can only be guaranteed that the smoothness of an outer function is at least one half of that for its modulus, but the quantitative manifestation of this effect is different; in particular, it depends on the position of the point at which the smoothness is measured. Bibliography: 8 titles.

Keywords: half plane; case; upper half; half; function

Journal Title: Journal of Mathematical Sciences
Year Published: 2018

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